TY - GEN
T1 - Control for Au-Ag Nanoporous Structure by Electrodeposition and Dealloying
AU - Saito, Mikiko
AU - Mizuno, Jun
AU - Koga, Shunichi
AU - Nishikawa, Hiroshi
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Number 25289241 and by MEXT, Japan .
Publisher Copyright:
© 2018 IEEE.
PY - 2018/11/26
Y1 - 2018/11/26
N2 - We investigated the composition, morphology, and dissolution behavior of an Au-Ag nanoporous structure formed by electrodeposition and dealloying. Formation of the films was carried out by changing the bath composition and the annealing temperature. The amount of Ag decreased from 70 wt. % to 45-50 wt. % after dealloying. As seen from analysis by a glow discharge optical emission spectrometer (GDOES), not only the amount of Ag, but also that of Au was decreased after dealloying, and a highly concentrated Ag layer was generated at the surface. When the Ag dissolves, an underpotential deposition (UPD) might be introduced, followed by the generation of a high concentration of Ag. From the anodic polarization measurement, the anodic current densities of the samples under 1.5 V were larger than those of the samples under 1.0 V, resulting in the generation of many nanopores. It was confirmed that dealloying involved three processes: whole film dissolution (includes Au dissolution), defects dissolution at the grain boundary, and Ag-selective dissolution.
AB - We investigated the composition, morphology, and dissolution behavior of an Au-Ag nanoporous structure formed by electrodeposition and dealloying. Formation of the films was carried out by changing the bath composition and the annealing temperature. The amount of Ag decreased from 70 wt. % to 45-50 wt. % after dealloying. As seen from analysis by a glow discharge optical emission spectrometer (GDOES), not only the amount of Ag, but also that of Au was decreased after dealloying, and a highly concentrated Ag layer was generated at the surface. When the Ag dissolves, an underpotential deposition (UPD) might be introduced, followed by the generation of a high concentration of Ag. From the anodic polarization measurement, the anodic current densities of the samples under 1.5 V were larger than those of the samples under 1.0 V, resulting in the generation of many nanopores. It was confirmed that dealloying involved three processes: whole film dissolution (includes Au dissolution), defects dissolution at the grain boundary, and Ag-selective dissolution.
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U2 - 10.1109/ESTC.2018.8546350
DO - 10.1109/ESTC.2018.8546350
M3 - Conference contribution
AN - SCOPUS:85060055557
T3 - 2018 7th Electronic System-Integration Technology Conference, ESTC 2018 - Proceedings
BT - 2018 7th Electronic System-Integration Technology Conference, ESTC 2018 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 7th Electronic System-Integration Technology Conference, ESTC 2018
Y2 - 18 September 2018 through 21 September 2018
ER -